A dispersion of n-alkanes in water has been elaborated for thermal energy storage and transport. Quantitative results regarding the thermophysical properties of the material are presented and compared with results obtained from correlations based on combination of the properties of the suspending phase and the dispersed phase. Thermorheological investigations of the material at various temperatures have shown a shear-thinning behaviour. The temperature dependence of the viscosity exhibits a slight jump near 9.5 degrees C, corresponding to the phase change temperature. This deviation is interpreted in terms of a change in the particle state near the phase change temperature. This thermo-rheological behaviour obeys a power law model in which the parameters are temperature dependent. Its range of viscosity and its high heat capacity render the material particularly attractive in cooling and air conditioning processes.